ID:
publications-2850
Type:
Peer reviewed articles
Year:
2018
Authors:
Christian Gruber, Sergei Rudenko, Andreas Groh, Dimitrios Ampatzidis, Elisa Fagiolini
Title:
Earth's surface mass transport derived from GRACE, evaluated by GPS, ICESat, hydrological modeling and altimetry satellite orbits
Venue/Journal:
Earth Surface Dynamics Discussions
DOI:
10.5194/esurf-2017-70
Research type:
Simulation & Modeling
Water System:
Precipitation & Ecological Systems
Technical Focus:
Abstract:
Abstract. The Gravity Recovery and Climate Experiment (GRACE) has delivered the most accurate quantification of global mass variations with monthly temporal resolution on large spatial scales. Future gravity missions will take advantage of improved measurement technologies such as enhanced orbit configurations and tracking systems as well as reduced temporal aliasing errors and latencies. In order to facilitate the usage of sub-monthly to daily innovate models, mass equivalent representations are computed. In addition, non-conventional processing techniques based on spherical radial basis functions (RBF) and mascons will give the ability to compute models in regional and global representations as well. The present study compares for the first time a complete global series of daily mass equivalent solutions obtained by the RBF method with conventional solutions in order to quantify recent ice-mass changes. We further compare the ice-induced crustal deformations due to the dynamic loading of the crustal layer with the Global Positioning System (GPS) uplift measurements along Greenland's coastline. Available mass change estimates based on ICESat (Ice, Cloud, and land Elevation Satellite) laser altimetry measurements both in Greenland and Antarctica are used to asses the GRACE results. A comparison of GRACE time series with hydrological modeling for various basin extensions reveals overall high correlation to surface and groundwater storage compartments. The forward computation of satellite orbits for altimetry satellites such as Envisat, Jason-1 and Jason-2 compares the performance of GRACE time variable gravity fields with models including time variability, such as EIGEN-6S4.
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637010
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